Rena Desai Callahan, M.D.
NPI 1487856779ActiveIndividual· Internal Medicine· Valencia, CA
Internal Medicine (M.D.) in Valencia, California, trained at Perelman School of Med at the University of Pennsylvania (class of 2004). Their prescriptions cost Medicare Part D more than their services did: $3,503,350 for 955 claims, against $1,796,279 paid for services in 2024. Gilead Sciences, Inc. was the largest of 7 companies reporting payments in 2025, $107,487 in all, mostly speaking and faculty fees.
Overview
| NPI | 1487856779 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 31, 2007 |
| Last updated in NPPES | Jan 23, 2020 |
| Certified by provider | Jan 23, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A94238 | CA |
| Internal Medicine, Hematology | 207RH0000X | A94238 | CA |
| Internal Medicine, Medical Oncology | 207RX0202X | A94238 | CA |
| Surgery, Surgical Oncology | 2086X0206X | A94238 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 597 |
|---|---|
| Services billed | 85,283 across 126 procedure codes |
| Paid by Medicare | $1,796,279 |
Part D prescriptions in 2024
| Prescriptions (claims) | 955 · 1,849 30-day fills |
|---|---|
| Patients | 215 |
| Total drug cost | $3,503,350 |
| Generic share | 70% of claims |
Education and affiliations
| Medical school | Perelman School of Med at the University of Pennsylvania |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine, Surgical Oncology |
| Telehealth | Offers telehealth |
Medical group
- The Regents of the University of CaliforniaSanta Monica, CA · 1,462 clinicians
Hospital affiliations
- Henry Mayo Newhall HospitalValencia, CA
- Ronald Reagan UCLA Medical CenterLos Angeles, CA
- Santa Monica - UCLA Med Ctr & Orthopaedic HospitalSanta Monica, CA
- UCLA West Valley Medical CenterWest Hills, CA
Industry payments (Open Payments)
- 2025$107,487 · 102 payments from 7 companies
- 2024$114,074 · 106 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $38,950 | 41 |
| Stemline Therapeutics Inc. | $27,768 | 26 |
| Astrazeneca Pharmaceuticals LP | $26,414 | 21 |
| Daiichi Sankyo Inc. | $11,436 | 8 |
| Novartis Pharmaceuticals Corporation | $1,453 | 3 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$77,280 · 21 payments
- Consulting Fee$18,345 · 11 payments
- Travel and Lodging$9,014 · 39 payments
- Food and Beverage$2,817 · 30 payments
- Education$30.65 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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